Here's what I've got to so far, Intel Z390 chipset seems good. The reviews say that for some reason the Gigabytes are better than the ASUS on this new chipset.

I've given up buying on NewEgg, I just read the reviews.

Gigabyte Z390 LGA1151 AORUS Ultra (sort of mid-high end)

Going to try an M2 SATA EVO 860 SSD, 1TB is probably plenty

I have a good new power supply lying around.

For GPU.... I am not sure. I may just take the RX 580 from my old rig and use it for now to save money.
Looking at Vega 56 from ASUS or XFX but they are big $$$ (somewhere between 1070 and 1080 performance).
Yeah I know AMD blah blah. I like Eyefinity with my monitor setup.

Case

How much RAM are people running these days? 16GB? Corsair still good? 3200MHz?

CPU I am thinking Intel Core i7-8700K Coffee Lake (thanks Derek)

CPU cooler??? (I need to check this fits the case and also clears the RAM and PCIe slots)
Liquid cooling any better these days?

This will be my first bare metal Win 10 gaming setup. My current Win 7 rig has been the same OS image and games since almost BF2 days.